BG2 is quite linear in the main plot, but there are still some attempts to hide that linearity, and they are quite successful for the most part. The slayer, for instance, is a very solid concept, which allows to actually express your character's identity. I think it should have been explored more extensively.
But the real beauty is in side-quests, which, for the most part, are quite non-linear.
So, yeah, major RP elements are quite underdeveloped. However, coupled with great story and characters, these weak RPG elements are kind of obfuscated, making you feel like you are really playing a full-fledged RPG. That's what happened to me, and, frankly, I still consider it RPG. Perhaps, it's just that stereotype that Ive developed back when I first played it (it was a while ago), or an internal conflict of opinions on what a real RPG should be like? I don't know...
Irenicus has the best voiceactor ever. <3
I agree, though there's nothing much special in David Warner's voice, just the standart pompous RP. But damn it sounds great. Fits Jon perfectly.
Torment is a marvellous RPG (there is no internal conflict on this), one of the best ive ever played. However, I can't see the point in comparing it to other games, particularily BG2. Completely different games, albeit sharing both RPG and adventure elements.